"could not validate saml response" this adderror message is shown. what is the reason behind it?

[koushik_snow]

when a user going to login via saml 2.0 .This   message is showing "could not validate saml response" .Can anyone please explain what is the reason behind it?

[Chuck Tomasi]

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Re: SAML Error - Could not validate SAML response

Could not validate SAML Response